Niall Caille

Niall Caille (785-846) was King of Ailech from 823 to 846 (succeeding Murchad mac Maele Duin and preceding Mael Duin mac Aeda) and High King of Ireland from 833 to 846 (succeeding Conchobar mac Donnchada and preceding Aed Findliath).

Biography
Niall Caille was born in 785, the son of High King of Ireland Aed Oirdnide. He became King of Ailech after Murchad mac Maele Duin was overthrown in 823, and he went to war with Airgialla in 827. Niall defeated and killed the Airgialla king Cummascach mac Cathail and many other local kings at Armagh, breaking Airgialla's power. In 833, he became High King of Ireland, and he defeated the Vikings at Derry, made Bran mac Faelain the puppet king of Leinster in 835, fought Munster to a draw from 836 to 838, and finally defeated Munster at Mag nOchtair in 841. He drowned in the Callan River in 846, earning him the epithet "Caille". His son Aed Findliath succeeded him as High King.